When I bought my R32 Skyline GT-R I did it in two trips.
First trip I rented a cheap car from Enterprise and drove 1000 miles to go see it. Test drove the car, talked to the dealer, etc.
After deciding that was the car I wanted I made arrangements for it to go to a shop. Here in CA Imported cars have to be made smog legal. So the shop had the R32 for 6 months running it on a dyno, changing the tune etc.
When the car was ready I flew out, and drove her home.
Obviously you don't need to make the car smog legal. But I do recommend that you drive or fly out, make sure it is what you really want, then send it to a shop for inspection.
What may seem to be a little issue on a Boxster.... like a demon possessed driver side window is something not to take lightly.
